National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

76°F

24°C

Humidity 52%
Wind Speed S 14 mph
Barometer 29.95 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 17 May 11:15 pm CDT
Extended Forecast for

Benton ILSimilar City Names

  • Overnight

    Overnight: Partly cloudy, with a low around 72. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 5pm. Mostly sunny, with a high near 88. South wind 11 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 88 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely, mainly before midnight. Partly cloudy, with a low around 72. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 72 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 87. South southwest wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    High: 87 °F

    Chance
    Showers then
    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 62. West southwest wind 5 to 9 mph becoming light and variable. Chance of precipitation is 90%.

    Low: 62 °F

    Showers

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 73. North wind around 10 mph. Chance of precipitation is 20%.

    High: 73 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 54. Northeast wind 6 to 8 mph.

    Low: 54 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 74. East northeast wind around 8 mph.

    High: 74 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind 3 to 6 mph.

    Low: 58 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 72. South wind around 11 mph, with gusts as high as 21 mph.
Monday
Showers and thunderstorms likely, mainly after 5pm. Mostly sunny, with a high near 88. South wind 11 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday Night
Showers and thunderstorms likely, mainly before midnight. Partly cloudy, with a low around 72. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Tuesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 87. South southwest wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 62. West southwest wind 5 to 9 mph becoming light and variable. Chance of precipitation is 90%.
Wednesday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 73. North wind around 10 mph. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54. Northeast wind 6 to 8 mph.
Thursday
Partly sunny, with a high near 74. East northeast wind around 8 mph.
Thursday Night
A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind 3 to 6 mph.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 77. East southeast wind around 6 mph becoming west southwest in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Calm wind becoming east around 5 mph in the morning.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Light south southwest wind.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming south around 6 mph in the morning.
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ABOUT THIS FORECAST

 
Point Forecast:
Benton ILSimilar City Names
 38°N 88.93°W
Last Update:
9:11 pm CDT May 17, 2026
Forecast Valid:
12am CDT May 18, 2026-6pm CDT May 24, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation